Transport Properties of Combustion Derived Na₂MnSiO₄

Na₂MnSiO₄ (NMS) has been considered a promising cathode material for Na⁺ battery. Importantly, the electrochemical performance of NMS cathode material is directly correlated with the transport behavior of Na⁺ into the bulk of NMS crystal. Herein, the bulk transport properties of monoclinic-NMS, synthesized by the urea combustion method, are investigated by AC electrochemical impedance spectroscopy (EIS) and I-V measurement techniques at room temperature for the first time. The impedance response recorded in the frequency range of 10mHz-1MHz shows a depressed semicircle that suggests the bulk contribution to the resistance. The AC conductivity of NMS is found to be 6.5(±0.5) × 10^-7 S cm^-1 whereas DC conductivity is calculated to be 5.8(±0.5) × 10^-8 S cm^-1.